Expansion of e.g.f. cos(x)/(1+x).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-3a(4) =13a(5) =-65a(6) =389a(7) =-2723a(8) =21785a(9) =-196065a(10) =1960649a(11) =-21567139a(12) =258805669a(13) =-3364473697a(14) =47102631757a(15) =-706539476355